Safety means for hoists and the like



V 1,641,957 Sept. 13, c, F. BLEDSOE SAFETY MEANS FOR HoIsTs AND THE LIKEFiled June 19, 1926 2 Sheets-Shed L p 927 c. F. BLEDSQE SAFETY MEANS FORHOISTS AND THE LIKE Filed June 19, 1926 2 She ets-Sheet 2 Patented Sept.13, 1927.

- g sm res" CARL rnnnnniv BLn H V v 1,641,957 PATENT OFFICE.

Dson, or CHICAGO, ILLINOIS, .assmlvoaro OGLE CONSTRUCTION COMPANY, 15.003203111 1011; orrmmors. 1

' autu n nonnoistrs 1min m me.

npplicatio nnled June 19, 1mffse a 'n 117,024.

hoisting apparatus embodying oppositely moving buckets involving thlsnvention.

Figure-Qisa diagrammatic View of parts.

of av hoisting apparatus. in'which a single bucket is, used,involvingthisinvention,

Figure 3 is a fragmentary elevational view of the safety means involvingth1s.1nen on.

Figure 4 is a top plan view of the structureshowninFigureB. k I

Figure 5 is a sectiinalviewupon thellne V -,-V 0 F gu I This inventionits jibroadest aspects comprises a plurality. of movable memberswhich'may' bein the form of a pair of buckets, receptacles, carsOI'itllQllkG, or one of 1 which nlay constitutea counterweight; and

- means including cables for moving the same in combination with meansindependent 9 said cablesfor" sustaining/said members in casea cablefails by breaking or tearing -aapart or' the like. As the invention is:very usefnl in'c'onnection with hoisting appara-- tus, I haveillustrated the application there,-

of in connection with ahoisting apparatus. Referring to Figure l, thereis shown a hoisting machine 1 which may be of the type disclosed inmyacopending application, Serial No. 46,621, filed July 28, 1925, and

which embodies a drum 2 and slack arms 3. Cables 4, which are attachedto the drum, extend over a guide drum or pulley 5. From the pulley 5,one cable extends over the load supporting pulleys 6 and 7 and isattachedto a coal or ash hoisting bucket 8 by a suitable bail 9; theother cable is trained over a pulley 10 and is attached in a similar wayto a similar bucket 8. The

i cables 4 are attached to the drum 2 in such a manner that one willwind up and elevate one bucket and the other will unwind and' lower theother bucket as the drum. is rot'atedi The mechanism so far described isold a and well-known and for thisf'reasonit has been onlydiagrammatically illustrated. f

. In the "operation of such a hoisting'appa-i ratus, the cable' '4 thatsustains the loaded bucket sometimes fails, that is, it breaks,

whereby the loaded bucketdrops. This has proven objectionable. Thisinvention while designed to remedy such a defect. I

In the embodiment that is chosen to il: lustrate this invention, aflexible connection or cable 11, which has its ends attached to,

'65 v not restricted to hoisting apparatushas been I the buckets 8,is'trained over a pair of pul leys12 mounted upon a stationarysupport'13 above the buckets. An intermediate portion of this cableextendsbetween thepulleys 12 in the form of a loop 14. A pulley 15. issupported in this loop and is freely movable in a vertical direction.Guides 16 A are preferably provided for guiding the pulley 15 andconfining its movements in a vertical direction. The guides 16, whichare preferably of channel shape in cross SQCtlOIl, engage the sidestrips 17 of a rectangular frame or block 17 a in which the pulley isjournalled. A counterweight 118?.

is suspended from the pulley block tomain tain'the' same in verticalposition.

The aforementioned support 13 consists of a pair ofparallel members 18as shown in Figure 4. A brake shoe 18 is pivotedto the inner side ofeach member 13" adjacent each pulley 12 for engagement therewith," Alink 19 is pivoted to each brake shoe. The lower ends of the links arepivoted upon :a common pivot pin 20 in an abutment block 21 adapted tobe engaged by the pulley block 17 when thepulley 15 is elevated as willhereinafter be more fully explained. InFigure 2, there is illustrated anappa other cable 4 is attached to the stud 24 and 4 trained under thepulley 23 and over the pulley 6. The other ends of these cables 4-. areadapted to be attached to the drum of the hoisting machine.

In operating the appa "atus herein explained, the hoisting machine,which automatically reverses itsell, will alternately raise and lower abucket, the other bucket or counter weight will of course move in theopposite direction. Now assume that one 01' the cables l, especially theone that sustains the load, should lail whereby the loaded bucket isreleased. The weight of such bucket will be immediately sustained by thesafety cable 11. This weight on the safety cable will elevate the pulley15 for applying the brakes 18 and stopping rotation of the pulleys 12.The t'riction between the cable and pulleys will prevent the cable fromsliding, so that the load will be held suspended from the safety cable.This will prevent injury arising through a talling load to either thebucket or a workman.

I am aware that many changes may be made, and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and l therelore do not purposelimiting the patent granted hereon, otherwise than necessitated by theprior art.

I claim as my invention:

1. In an apparatus of the class described, a pair of oppositely movablemembers, a hoisting machine comprising a drum, cables connecting saidmembers and drum, sheaves for supporting said cables, a pair of pulleyssupported above said members, a cable trained over said pulleys andattached to said members and means for braking said pulleys when eitherof said lirst mentioned cables tail.

2. The combination with a hoisting machine including a drum, a pair ofreceptacles having cable connections with said drum, and means forsustaining said re ceptacles it a cable connection l'ails, comprising acable attached to said receptacles, pulleys for supporting said cable,and means set in motion by said cable for b 'aking said pulleys when acable connection tails.

3.111 an apparatus ol the class described, a support, a pair of pulleysmounted upon said support, a cable trained over said pulleys,receptacles attached to the ends of said cable, an intermediate portionof said cable extending betwen said pulleys in the form of a loop, amovable pulley supported in said loop, brakes for said first mentionedo. In an apparatus of the class described,

a pair of receptacles, means including cables for moving saidreceptacles, a stationary support including a pair of pulleys, aflexible connection surrounding said pulleys and attached to saidreceptacles, a pair of brakes for said pulleys, and means actuated bsaid flexible connection for simultaneously applying said brakes when acable lails.

6. In an apparatus of the class described, a stationary support, a pairof pulleys on said support, a cable trained over said pulleys andextending in the form of a loop between said pulleys, receptaclesattached to the ends of said cable, brakes for said pulleys, a rotarydevice mounted in said loop and having means for actuating said brakes,and operating means for said reccptacles.

T. In an apparatus of the class described, oppositely movable members,power means, connections between said power means and members for movingthe latter in opposite directions, independent sustaining means for saidmembers comprising stationary rotary devices, brakes for said rotarydevices, and means for applying said brakes when one of said connectionstail.

8. In an apparatus of the class descrflaed, oppositely movable members,a safety cable attached to said members, supporting means for saidcable, movable braking means for said supporting means and meansoperated by said cable for actuating -said braking means when said cablesustains said members.

In testimony whereof I have hereunto subscribed my name.

CARL FREEMAN BLEDSOE.

